Double-acting pump



Oct. 14, 1930. J. c. CAIRNCROSS DOUBLE ACTING PUMP Filed June 21. 1929James ff'fbzinc'ross ATTORNE Patented Oct. 14, 1930 PATENT OFFICE JAMESC. CAIRNCROSS, F NASHUA, MONTANA DOUBLE-ACTING PUMP Application filedJune 21,

This invention relates to a four-valve double acting pump, the generalobject of the invention being to provide a double acting pump which isof simple construction and the parts of which are readily accessible forrepair and other purposes and one which may be used for deep wells andwhich may be used on a suction pipe having a drive point or sand pointor an ordinary suction pipe.

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts, to behereinafter fully described, illustrated in the accompanying drawing andspecifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to theaccompanying drawings wherein like character-s denote. like orcorresponding parts throughout the severalviews, and in which Figure 1is a longitudinal sectional view through the improved pump, the sectionbeing taken on the line 1-1 of Figure 2.

Figure 2 is a section on line 2-2 of Figure 1.

Figure 3 is a section on line 3-3 of Figure 1.

Figure 4 is a section on line 44 of Figure 1.

In these views, the numeral 1 indicates the cylinder member of the pumpwhich is formed with the rings 2 at opposite sides thereof having thepassages 3'and 3 therein, a

these passages being parallel to the cylinder '1'. A port 4 connects thelower end of the cylinder-with the lower end of the passage 8 and a port5 connectsthe upper end of the cylinder with the upper end of thepassage 3', these ports being diagonally arranged, as shown. The upperand lower caps 6 are bolted to the ends of the cylinder member, as shownat 7, gaskets8 being placed between the parts, and each cap is formedwith a pair ofrsockets 9, the sockets of the lower cap extending intothe threaded bore 10 of the cap, while the sockets of the upper cap openout through the inner face thereof. The lower end of each socket isthreaded to receive the" threaded valve seat 11 and a 1929. Serial No.872,687.

spherical valve 12 rests on each seat. One of the valve seats of theupper cap has a diagonally arranged passage therethrough, as shown at11. The upper sockets communicate with the passages 3 and 3 and thelower sockets are connected with the lower ends of the passages by thepassages 13 formed in the lower cap.

A piston 14 is arranged in the cylinder 1 and the rod 15 thereof passesthrough the upper cap and through a guiding tube 16 which has its lowerend threaded in a socket 17 formed in the upper part of the cap.Lubricant retaining means 18 are placed in the lower part of the socketand surround a portion of the rod 15. A packing gland 19 is arranged atthe upper end of the tube 16 through which the rod passes and the upperpart of the tube is provided with a nipple 20 whereb lubricant can beforced into the tube to lubricate the rod and the inner walls of thetube, this lubricant reaching the means 18 in the socket 17.

A suction pipe 21 has its upper end threaded in thebore 10 and adischarge pipe 22 is threaded in the upper part of the upper cap 6. p a

From the foregoing it will be seen that on the up stroke of the piston14, the suction created in the lower part of the cylinder will drawfluid from the suction pipe, past the valve 12 in the right hand socket9 of the lower cap and through the passage 13, the lower part of thepassage 3 and port 4 into said lower part of the cylinder and at thesame time, the fluid in the upper part of the cylinder will be forcedthrough the port 5 and the left hand socket of the top cap through thepassage 13' into the discharge pipe 22. On the down stroke of thepiston, a suction will be created in the passage 3 through the port 5 sothat fluid will be drawn from the suction pipe into the passage 3 andthis fluid will pass through the port 5 into the top part of thecylinder. The fluid in the lower part of the cylinder will be forced bythe piston through the port 4, passage 3 and through the socket and itspassage at the right hand side into the discharge port. Thus at eachstroke of the piston, fluid will be discharged from the cylinder andmore fluid'drawn into the cylinder.

As will be seen, this pump is very compact and simple and the parts areeasily accessible for repair and other purposes. The parts can helubricated from the top of the pump and the packing can be easily,adjusted or repackedwhennecessary, and as the piston rod is thoroughlylubricated by the means shown, friction and wear are reduced to aminimum. 7

It is thought from the foregoing description that the advantages andno-vel---features of the invention will be readily apparent.

It is to be understood that changes may be made in theconstruction andinthe combination and arrangement of the several ,parts,

provided that such changes fall within the pe o heenr ded, cl

What Lclai'm is i j A double acting pump. comprising a cylinder havingamaXia-lly located bore and longitudinal passages atopposite sides ofthe bore, heads fittedto-the' upper and lower/ends oi the cylinder and--closing the. upper and lowerends of the bore, each head having: a-

hollow neck for theconnection of a fluid con- 7 ducting; pipe, the upperhead having sockets in its undersideand upwardlyand inwardly inclinedpassages communicating at their lower ends with the said sockets and attheir upperendswith the neck, a valve seat-in the lower end of eachsocket a ball check valve resting on each seat, one of the valve seatscommunicating directly with the. respective passage in the cylinder andthe cylinder having a branch passage in its wallcommunicating withtheother valve seat and withxthe upper end of the respective passageinthe cylinder, the other-valve seat Ofthe upper headbeing provided withan inclined passageway substantially in alinement with. the

' respective in lined passage in the upper head,

the lower head having passages therein communicating at their upperendswith the lower ends ofthe respective passages, in :thc. cylinder andcurved inwardly s-and communicatat their lower endswith the respectivesocketsinthe lowerl ead, andthe cylinder having a passage in its lowerend in communication with one side of thelast mentioned passage in thecylinder.

In testimony whereof I 111V signature.

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